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    • 2. 发明公开
    • Process for the manufacture of pure amorphous silica from rocks
    • Verfahren zur Herstellung von reinen amorphenKieselsäurenaus Gesteinen。
    • EP0610136A1
    • 1994-08-10
    • EP94400218.7
    • 1994-02-02
    • ROTEM AMFERT NEGEV LTD.
    • Iosef, Alexander
    • C01B33/193
    • C01B33/193C01P2002/02C01P2006/11C01P2006/12C01P2006/80C01P2006/82
    • A process for the manufacture of pure amorphous silica from rocks containing non-crystalline silica is described. The process comprises the steps of:
      (a) dissolution of said rock in an alkaline solution comprising sodium hydroxide and sodium carbonate, obtaining a solution of sodium silicate; (b) precipitation of pure amorphous silica by adding sodium bicarbonate into said sodium silicate and co-producing sodium carbonate, the weight ratio between SiO₂ and Na₂O in said dissolution step is in the range of between 0.5 to 3.0; and (c) the sodium carbonate sclution is transformed into crystalline sodium bicarbonate, by a salting out reaction with sodium chloride, being recycled to the process. According to a preferred embodiment, the alkaline solution is obtained by the caustification of sodium carbonate with calcium hydroxide. The preferred concentration of sodium hydroxide in said dissolution step is in the range of 4% to 14% by weight.
    • 描述了从含有非结晶二氧化硅的岩石制造纯无定形二氧化硅的方法。 该方法包括以下步骤:(a)将所述岩石溶解在包含氢氧化钠和碳酸钠的碱性溶液中,得到硅酸钠溶液; (b)通过向所述硅酸钠中加入碳酸氢钠并共同生产碳酸钠沉淀纯无定形二氧化硅,所述溶解步骤中SiO 2与Na 2 O的重量比在0.5至3.0的范围内; 和(c)通过与氯化钠的盐析反应将碳酸钠溶液转化成结晶碳酸氢钠,再循环到该方法中。 根据优选的实施方案,碱性溶液是通过用氢氧化钙对碳酸钠进行除碱而得到的。 所述溶解步骤中优选的氢氧化钠浓度在4重量%至14重量%的范围内。
    • 5. 发明公开
    • Process for the manufacturing of sulfur-containing fertilizers
    • Verfahren zur Herstellung von schwefelenthaltendenDüngemitteln
    • EP0719748A2
    • 1996-07-03
    • EP95402939.3
    • 1995-12-26
    • ROTEM AMFERT NEGEV LTD.
    • Stern, ShmuelBen-Yoseph, Eli
    • C05G3/00B01J2/00C05B17/00C05B19/00
    • C05G3/0023
    • The invention relates to a process for obtaining sulfur-containing fertilizers. According to the invention, a substrate containing fertilizer particles is heated to a temperature above the melting point of sulfur and subsequently by admixing with the sulfur, the latter is melted by the heat provided by said preheated fertilizer particles, producing a homogeneous coating on the fertilizer particles. According to a preferred embodiment the temperature at which the fertilizer particles are heated will be in the range of 140°C to 280°C. Other materials may be added either into the phosphate or to the resulted mixture, having the purpose to modify the physical nature of the sulfur. The sulfur availability from the coated fertilizer particles may be adjusted by varying the temperature at which the fertilizer particles are heated. Typical examples of fertilizers useful for the process are: phosphate rock, superphosphate, monopotassium phosphate, triple superphosphate and potassium chloride.
    • 本发明涉及一种获得含硫肥料的方法。 根据本发明,将含有肥料颗粒的底物加热到高于硫熔点的温度,随后通过与硫混合,后者由所述预热的肥料颗粒提供的热量熔化,在肥料上产生均匀的涂层 粒子。 根据优选的实施方案,肥料颗粒被加热的温度将在140℃至280℃的范围内。其它材料可以添加到磷酸盐或所得混合物中,目的是改变物理 硫的性质。 可以通过改变肥料颗粒被加热的温度来调节来自涂覆的肥料颗粒的硫的可用性。 用于该方法的肥料的典型实例是:磷酸盐岩,过磷酸钙,磷酸二氢钾,过磷酸三钙和氯化钾。